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RTD – thermoresistance

RTD-Thermoresistance sensors are elements that vary their resistive value as a function of temperature. They are typically made with Platinum (Pt) and can be made either with wire wrapped on a ceramic support (wire wrapped) or by deposition on a layer of ceramic (thin film). There are different reference values (Pt100-Pt1000-Pt500) that refer to the resistance value at 0°C and the reference standard is EN-60751 with different precision classes. Reference is often made to the DIN43760 Standard for the most precise selection values (1/3DIN-1/5DIN-1/10DIN) where the reference value is Class B. The DIN43760 Standard is no longer currently valid but remains as an indication of more precise sensor selection.

RTD-Thermoresistance sensors are elements that vary their resistive value as a function of temperature. They are typically made with Platinum (Pt) and can be made either with wire wrapped on a ceramic support (wire wrapped) or by deposition on a layer of ceramic (thin film). There are different reference values (Pt100-Pt1000-Pt500) that refer to the resistance value at 0°C and the reference standard is EN-60751 with different precision classes. Reference is often made to the DIN43760 Standard for the most precise selection values (1/3DIN-1/5DIN-1/10DIN) where the reference value is Class B. The DIN43760 Standard is no longer currently valid but remains as an indication of more precise sensor selection.

Normally Pt100 sensitive elements are the most used in the industrial field but normally require a 3-wire or 4-wire connection in more precise systems to compensate the length and the resistance of the conductors.

Sensors with Pt500 or Pt1000 sensitive element are used with a 2-wire connection as the resistance of the conductors does not generate a significant error on the measurement.

Being a resistive component, the RTD has no polarity. The colours of the cables, however, serve to identify the signal wires from those for compensating the length of the cable itself.

The RTD-Resistance Temperature Probes can be supplied with Temperature Transmitters/Converters with 4-20mA, 0-10V output, or with digital buses depending on the connection needs present in the system. These options offer superior performance for sensor reading and configuration, enabling precise and reliable monitoring.

For simpler applications and in a more limited scale range, PTC and NTC sensors are also used where, however, a reference standard is not defined and when ordering the basic value at 0°C and a coefficient β which determines the Temperature°C/Resistive value Ω ratio have to be specified.

In the 2H-Term product families, the codes identified by the letter xxR are products with a thermoresistance sensitive element.

Main features

  • Stability and precision of measurement
  • Range
  • Easy connection

RTD-Thermoresistance sensors are known for their stability and precision, operating in a temperature range from -200°C to +600°C.

Tolerance reference classes are valid with narrower range values.

These sensors are connected to the reading instruments using standard electrical conductors, offering a very flexible solution in the choice of standard connection cables.

Ranges and Tolerances

Thermoresistances

Class Type Range°C Tolerance °C
1/10Din Wire wound -50 ÷ +250 0.03°C@0°C
AA Wire wound -50 ÷ +250 ± (0,1 + 0.0017 *| t |)
Thin Film -0 ÷ +150
A Wire wound -100 ÷ +450 ± (0,15 + 0.002 *| t |)
Thin Film -30 ÷ +300
B Wire wound -196 ÷ +600 ± (0,3 + 0.005 *| t |)
Thin film -50 ÷ +500

The choice of materials and technical solutions is the result of over 30 years of experience that 2H-Term puts at your disposal. We can offer both standard Temperature Probes and customized Temperature Probes, providing comprehensive support to identify the best solution based on your specific needs and applications.

Connections

2 Wires 3 Wires 4 Wires
White White White
White
Red Red Red
Red Red

We make custom temperature probes and sensors.
Contact us for any information or send an email to info@2hterm.it.